Whether it be on the Mac with iTunes libraries, or iPhoto libraries, or on iOS devices like the iPad (iPhones are pretty much user specific), Apple has never really made it easy for families, or even a husband and wife, to share content. I tried at some point to have two user accounts on my iMac for my wife and I but one shared iPhoto and one shared iTunes library. I had to totally mess with permission structures in terminal and you couldn't open the same app on both users at the same time, which meant closing iTunes on my side before fast switching to hers, etc., just to keep the libraries matched. What if she wanted to email a photo or sync music to her iPod, should she have to be logged into my account and see all my playlists, or use my email. Same with Safari bookmarks. And now that we have an iPad, I don't even have her me.com email only account on there, just mine. All our apps and music uses my master Apple ID/iTunes ID which is a mac.com even though we have used me.com emails since the .Mac to MobileMe transition. iCloud honestly make more of a mess of this. They promote iLife for family stuff, but have always made computers and devices for individuals, never offering solutions to bring it all together.